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--- manual:user_guide:tools:altitude [2023/06/09 15:58] – mstupka
+++ manual:user_guide:tools:altitude [2024/02/16 12:11] (current) – mstupka
@@ Line 39: / Line 39: @@
   * **Altitude** - uses some other source of ground altitude - external maps, measuring, tourist guide posts, etc. as the reference. Locus Map then calibrates the pressure sensor according to this value.
 <WRAP  round important>Some devices e.g. Samsung Galaxy Note II turn off the pressure sensor in standby mode. If you want to use a pressure sensor during e.g. track recording, make sure your device maintains the pressure sensor on also when the screen goes off.
+</WRAP>
+===== Altitude measurement workflow =====
+Locus Map applies the above-mentioned computations in the following order:
+  * received altitude from the GNSS unit
+  * using elevation data files (if enabled)
+  * using the pressure sensor
+  * final filtering
+If step 2 is missing, the pressure sensor calibration uses directly received altitude values.
+<WRAP center round tip>
+The **recommended setup** is using elevation data (fully replacing GNSS) without a pressure sensor or using the elevation data only to optimize altitude (useful to eliminate unwanted peaks) + pressure sensor if it's available.
 </WRAP>

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